Collect values from put_html()

[MinaGithuub]

If I am using html with JavaScript code in put_html, how to get values from the code that is inside put_html so that I can decide using the needed pywebio inputs or pywebio outputs further ?

[wang0618]

Refer to #273

from pywebio.output import *
from pywebio.io_ctrl import output_register_callback


def click_callback(val):
    put_text(val)


def main():
    callback_id = output_register_callback(click_callback)

    put_html("""
    <button onclick="send_data()">Click me</button>
    <script>
    function send_data(){
        WebIO.pushData('data', %r)
    }
    </script>
    """%callback_id)


start_server(main, port=8080, debug=True)